Mathematicians propose be like this

Mathematicians propose be like this

1. x=0
2. r=a(1-sinθ) 
               or, 
     y=√{1-(|x|-1)²}, y=arccos(1-|x|)-π 
               or, 
     xy=1, x²+y²=9, y=2|x|, x=-3|siny|
3. x²=6y
For details

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